Code review comment for lp:~jacekn/charms/precise/rabbitmq-server/fixes

Thank you Tim.

The only charmhelpers change I made is to support hostname parameter, rest of them are just merged from upstream. There is already MP for the nagios hostname change waiting to be merged:
https://code.launchpad.net/~jacekn/charm-helpers/nrpe-hostname/+merge/218072